blow the cobwebs away
US /bloʊ ðə ˈkɑbˌwɛbz əˈweɪ/
UK /bloʊ ðə ˈkɑbˌwɛbz əˈweɪ/

1.
despejarse, airearse
to do something that makes you feel more active and awake, especially after a period of inactivity or rest
:
•
Let's go for a walk to blow the cobwebs away.
Vamos a dar un paseo para despejarnos.
•
A good run in the morning always helps me to blow the cobwebs away.
Una buena carrera por la mañana siempre me ayuda a despejarme.